Looking for a better replacement 50A recep and plug.

Have you ever installed one? Every replacement connector except the Progressive uses a simple screw to terminate the wire- it is a huge pita to get a #10 stranded wire all under that screw. The Progressive has a captive type termination- you stick the wire in a pocket and a set screw tightens against it- much, much better. The case is also not much larger than the molded. Plus, it's made in the USA.